Mai intai trebuie sa te autentifici.
Cod sursa(job #2810840)
Utilizator | Data | 30 noiembrie 2021 13:14:27 | |
---|---|---|---|
Problema | Cautare binara | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 1.51 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
void firstCase(int n, int v[], int x) {
int left = 1;
int right = n + 1;
while (left < right) {
int middle = (left + right) / 2;
if (v[middle] <= x) {
left = middle + 1;
} else {
right = middle;
}
}
if (v[left - 1] == x) {
fout << left - 1;
} else {
fout << -1;
}
}
void secondCase(int n, int v[], int x) {
int left = 1;
int right = n + 1;
while (left < right) {
int middle = (left + right) / 2;
if (v[middle] <= x) {
left = middle + 1;
} else {
right = middle;
}
}
fout << left - 1;
}
void thirdCase(int n, int v[], int x) {
int left = 1;
int right = n;
while (left < right) {
int middle = (left + right) / 2;
if (v[middle] < x) {
left = middle + 1;
} else {
right = middle;
}
}
fout << left;
}
int main() {
int n, v[100001];
fin >> n;
for (int i = 1; i <= n; ++i) {
fin >> v[i];
}
int cases;
fin >> cases;
for (int i = 1; i <= cases; ++i) {
int currentCase, x;
fin >> currentCase >> x;
if (currentCase == 0) {
firstCase(n, v, x);
} else if (currentCase == 1) {
secondCase(n, v, x);
} else {
thirdCase(n, v, x);
}
fout << "\n";
}
}